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<td> <div>Defined in header <code><a href="../../header/array.html" title="cpp/header/array">&lt;array&gt;</a></code>
 </div></td>
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<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N<span class="sy1">&gt;</span><br>
<span class="kw4">constexpr</span> <a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><a href="../../types/remove_cv.html"><span class="kw599">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, N<span class="sy1">&gt;</span> to_array<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&amp;</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-cxx20">(since C++20)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N<span class="sy1">&gt;</span><br>
<span class="kw4">constexpr</span> <a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><a href="../../types/remove_cv.html"><span class="kw599">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, N<span class="sy1">&gt;</span> to_array<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&amp;&amp;</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-cxx20">(since C++20)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Creates a <span class="t-lc"><a href="../array.html" title="cpp/container/array">std::array</a></span> from the one dimensional built-in array <code>a</code>. The elements of the <code>std::array</code> are copy-initialized from the corresponding element of <code>a</code>. Copying or moving multidimensional built-in array is not supported.
</p>
<div class="t-li1"><span class="t-li">1)</span> For every <code>i</code> in <code>0, ..., N - 1</code>, copy-initializes result's correspond element with <span class="t-c"><span class="mw-geshi cpp source-cpp">a<span class="br0">[</span>i<span class="br0">]</span></span></span>. This overload is ill-formed when <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_constructible.html"><span class="kw527">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1">&lt;</span>T, T<span class="sy3">&amp;</span><span class="sy1">&gt;</span></span></span> is <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span>.</div>
<div class="t-li1"><span class="t-li">2)</span> For every <code>i</code> in <code>0, ..., N - 1</code>, move-initializes result's correspond element with <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">[</span>i<span class="br0">]</span><span class="br0">)</span></span></span>. This overload is ill-formed when <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_move_constructible.html"><span class="kw545">std::<span class="me2">is_move_constructible_v</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span></span></span> is <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span>.</div>
<p>Both overloads are ill-formed when <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../types/is_array.html"><span class="kw467">std::<span class="me2">is_array_v</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span></span></span> is <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span>.
</p>
<h3><span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  a
</td>
<td> -
</td>
<td>  the built-in array to be converted the <span class="t-lc"><a href="../array.html" title="cpp/container/array">std::array</a></span>
</td></tr>
<tr class="t-par-hitem">
<td colspan="3"> Type requirements
</td></tr>
<tr class="t-par-req">
<td colspan="3"> -<div class="spacer"></div><code>T</code> must meet the requirements of <a href="../../named_req/CopyConstructible.html" title="cpp/named req/CopyConstructible"><span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">CopyConstructible</span></a> in order to use overload (1).
</td></tr>
<tr class="t-par-req">
<td colspan="3"> -<div class="spacer"></div><code>T</code> must meet the requirements of <a href="../../named_req/MoveConstructible.html" title="cpp/named req/MoveConstructible"><span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">MoveConstructible</span></a> in order to use overload (2).
</td></tr></table>
<h3><span class="mw-headline" id="Return_value">Return value</span></h3>
<div class="t-li1"><span class="t-li">1)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><a href="../../types/remove_cv.html"><span class="kw599">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, N<span class="sy1">&gt;</span><span class="br0">{</span> a<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>, ..., a<span class="br0">[</span>N <span class="sy2">-</span> <span class="nu0">1</span><span class="br0">]</span> <span class="br0">}</span></span></span></div>
<div class="t-li1"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><a href="../../types/remove_cv.html"><span class="kw599">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, N<span class="sy1">&gt;</span><span class="br0">{</span> std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span><span class="br0">)</span>, ..., std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">[</span>N <span class="sy2">-</span> <span class="nu0">1</span><span class="br0">]</span><span class="br0">)</span> <span class="br0">}</span></span></span></div>
<h3><span class="mw-headline" id="Notes">Notes</span></h3>
<p>There are some occasions where <a href="../../language/deduction_guide.html" title="cpp/language/class template argument deduction">class template argument deduction</a> of <span class="t-lc"><a href="../array.html" title="cpp/container/array">std::array</a></span> cannot be used while <code>to_array</code> being available:
</p>
<ul><li> <code>to_array</code> can be used when the element type of the <code>std::array</code> is manually specified and the length is deduced, which is preferable when implicit conversion is wanted.
</li><li> <code>to_array</code> can copy a string literal, while class template argument deduction constructs a <code>std::array</code> of a single pointer to its first character.
</li></ul>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1">std<span class="sy4">::</span><span class="me2">to_array</span><span class="sy1">&lt;</span><span class="kw4">long</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">{</span><span class="nu0">3</span>, <span class="nu0">4</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// OK: implicit conversion</span>
<span class="co1">// std::array&lt;long&gt;{3, 4};   // error: too few template arguments</span>
std<span class="sy4">::</span><span class="me2">to_array</span><span class="br0">(</span><span class="st0">"foo"</span><span class="br0">)</span><span class="sy4">;</span>        <span class="co1">// creates std::array&lt;char, 4&gt;{ 'f', 'o', 'o', '\0' }</span>
<a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="br0">{</span><span class="st0">"foo"</span><span class="br0">}</span><span class="sy4">;</span>           <span class="co1">// creates std::array&lt;const char*, 1&gt;{ +"foo" }</span></pre></div></div>
<table class="wikitable">
<tr>
<td> <a href="../../feature_test.html#Library_features" title="cpp/feature test">Feature-test</a> macro:
</td>
<td> <a href="../../utility/feature_test.html" title="cpp/utility/feature test"><tt>__cpp_lib_to_array</tt></a>
</td></tr></table>
<h3><span class="mw-headline" id="Possible_implementation">Possible implementation</span></h3>
<table class="eq-fun-cpp-table">

<tr>
<th> First version
</th></tr>
<tr>
<td>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw1">namespace</span> detail <span class="br0">{</span>
 
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N, <a href="../../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a>... <span class="me1">I</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><a href="../../types/remove_cv.html"><span class="kw599">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, N<span class="sy1">&gt;</span>
    to_array_impl<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&amp;</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span>, <a href="../../utility/integer_sequence.html"><span class="kw1111">std::<span class="me2">index_sequence</span></span></a><span class="sy1">&lt;</span>I...<span class="sy1">&gt;</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw1">return</span> <span class="br0">{</span> <span class="br0">{</span>a<span class="br0">[</span>I<span class="br0">]</span>...<span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="br0">}</span>
 
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><a href="../../types/remove_cv.html"><span class="kw599">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, N<span class="sy1">&gt;</span> to_array<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&amp;</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw1">return</span> detail<span class="sy4">::</span><span class="me2">to_array_impl</span><span class="br0">(</span>a, <a href="../../utility/integer_sequence.html"><span class="kw1113">std::<span class="me2">make_index_sequence</span></span></a><span class="sy1">&lt;</span>N<span class="sy1">&gt;</span><span class="br0">{</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
</td></tr>
<tr>
<th> Second version
</th></tr>
<tr>
<td>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw1">namespace</span> detail <span class="br0">{</span>
 
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N, <a href="../../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a>... <span class="me1">I</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><a href="../../types/remove_cv.html"><span class="kw599">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, N<span class="sy1">&gt;</span>
    to_array_impl<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&amp;&amp;</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span>, <a href="../../utility/integer_sequence.html"><span class="kw1111">std::<span class="me2">index_sequence</span></span></a><span class="sy1">&lt;</span>I...<span class="sy1">&gt;</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw1">return</span> <span class="br0">{</span> <span class="br0">{</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">[</span>I<span class="br0">]</span><span class="br0">)</span>...<span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="br0">}</span>
 
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><a href="../../types/remove_cv.html"><span class="kw599">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, N<span class="sy1">&gt;</span> to_array<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&amp;&amp;</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw1">return</span> detail<span class="sy4">::</span><span class="me2">to_array_impl</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">)</span>, <a href="../../utility/integer_sequence.html"><span class="kw1113">std::<span class="me2">make_index_sequence</span></span></a><span class="sy1">&lt;</span>N<span class="sy1">&gt;</span><span class="br0">{</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
</td></tr></table>
<h3><span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;type_traits&gt;</span>
<span class="co2">#include &lt;utility&gt;</span>
<span class="co2">#include &lt;array&gt;</span>
<span class="co2">#include &lt;memory&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="co1">// copies a string literal</span>
    <span class="kw4">auto</span> a1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="br0">(</span><span class="st0">"foo"</span><span class="br0">)</span><span class="sy4">;</span>
    static_assert<span class="br0">(</span>a1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">4</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// deduces both element type and length</span>
    <span class="kw4">auto</span> a2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="br0">(</span><span class="br0">{</span> <span class="nu0">0</span>, <span class="nu0">2</span>, <span class="nu0">1</span>, <span class="nu0">3</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
    static_assert<span class="br0">(</span><a href="../../types/is_same.html"><span class="kw591">std::<span class="me2">is_same_v</span></span></a><span class="sy1">&lt;</span>decltype<span class="br0">(</span>a2<span class="br0">)</span>, <a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="nu0">4</span><span class="sy1">&gt;&gt;</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// deduces length with element type specified</span>
    <span class="co1">// implicit conversion happens</span>
    <span class="kw4">auto</span> a3 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="sy1">&lt;</span><span class="kw4">long</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">{</span> <span class="nu0">0</span>, <span class="nu0">1</span>, <span class="nu0">3</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
    static_assert<span class="br0">(</span><a href="../../types/is_same.html"><span class="kw591">std::<span class="me2">is_same_v</span></span></a><span class="sy1">&lt;</span>decltype<span class="br0">(</span>a3<span class="br0">)</span>, <a href="../array.html"><span class="kw1271">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><span class="kw4">long</span>, <span class="nu0">3</span><span class="sy1">&gt;&gt;</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="kw4">auto</span> a4 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="sy1">&lt;</span><a href="../../utility/pair.html"><span class="kw1099">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="kw4">float</span><span class="sy1">&gt;&gt;</span><span class="br0">(</span>
        <span class="br0">{</span> <span class="br0">{</span> <span class="nu0">3</span>, <span class="nu17">.0f</span> <span class="br0">}</span>, <span class="br0">{</span> <span class="nu0">4</span>, <span class="nu17">.1f</span> <span class="br0">}</span>, <span class="br0">{</span> <span class="nu0">4</span>, .1e23f <span class="br0">}</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
    static_assert<span class="br0">(</span>a4.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">3</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// creates a non-copyable std::array</span>
    <span class="kw4">auto</span> a5 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="br0">(</span><span class="br0">{</span> <a href="../../memory/unique_ptr/make_unique.html"><span class="kw736">std::<span class="me2">make_unique</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="nu0">3</span><span class="br0">)</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
    static_assert<span class="br0">(</span>a5.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// error: copying multidimensional arrays is not supported</span>
    <span class="co1">// char s[2][6] = { "nice", "thing" };</span>
    <span class="co1">// auto a6 = std::to_array(s);</span>
<span class="br0">}</span></pre></div></div>
</div>
<h3><span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../experimental/make_array.html" title="cpp/experimental/make array"> <span class="t-lines"><span>make_array</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(library fundamentals TS v2)</span></span></span></div></div>
</td>
<td>   Creates a <span class="t-lc"><a href="../array.html" title="cpp/container/array">std::array</a></span> object whose size and optionally element type are deduced from the arguments  <br> <span class="t-mark">(function template)</span> </td></tr>
</table>

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